You are driving a luxury car, don't forget that. A non-car person would never understand why you drive a BMW when a perfectly good Toyota (or whatever) used is the sound financial choice. I am self aware enough to know I have wrapped some of my entertainment dollars into my car and I am fine with that. So getting bored and getting a new car while still being able to meet all your other expenses and save for retirement is what you are supposed to do. Life is short enjoy what you can today and keep an eye on the future.
With that said if you know yourself, skip the extended warranty for now, someone will be glad to sell you one when your manufacturer's warranty runs out
if you keep the car that long